22. V(ms) P 1 1 Fig.1.100 3 11 6 21 The diagram above (Fig. 1.10) represents the velocity - time graph of a body in motion The total distance travelled by the body is 195m. Calculate the acceleration of the body in section OP of the graph.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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the components of a vector are the parts of the vectors that are to each other.

b perpendicular

snell's law

refractve index = sin incidence / sin refraction